chichester



(No Model.)

L. S. GHIGHESTER.

PULVERIZER.

No. 262,571. Patented Aug.15; 1882.

WITNESSES: INVENTOR gf S MAM L'A J41? N. Puma. mummy. MM. 0, c.

UNITED STATES PATENT EETQE.

LEWVIS S. GHIGHESTER, OE JERSEY CITY, NEW JERSEY, ASSIGNOR- TO FRANK M. HAYES, OF SAME PLACE.

PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 262,571, dated August 15, 1882.

Application filed April 4, 18852.

To all whom it may concern:

Be it known that I, LEWIS S. OHICHESTER, of Jersey City, county of Hudson, State of New Jersey, have invented a new and useful Improvement in Pulverizers, which is fully set forth in the following specification and accompanying drawings, in which- Figure 1 is a side view of my pulverizer, partly in section and partly in elevation Fig. 2, a cross-section of the same, at line a; x of Fig. 1; Fig. 3, an end view of the case; Figs. 4, 5, and 6, sectional views of different kinds of radial tubes.

The object of myinvention is to pulverize minerals, cereals, and other frangible substances by the aid of centrifugal motion arising from the rapid revolution of a hollow materialreceiving hub having hollow extension-arms, which are provided with air-inlets, said arms operating to impel the material against an inclosing metal circle.

I am aware that various revolving devices have been used to pulverize or reduce hard substances to a desired fineness.

It is well known that when hard substances are ground between moving surfaces such surfaces are exposed to destructive wear, and the space necessarily separating such surfaces determines or prevents extreme fineness of product. Also, when minerals, ores, 850., are exposed to the action of revolving heaters, asin rotary pulverizers and some other mills, the small surfaces which strike the blows and upon which the wear comes are soon destroyed. Besides, the product cannot be of uniform fin eness, as the intensity of the blows struck by the heating-surfaces varies as they occur on said surfaces farther from or nearer to the center of motion.

I am also aware that compressed air and superheated steam have been used to accomplish this work when forced through a stationary injector to hurl hard mineral and other substances against a fixed target, as also against a target revolving at right angles with the issuing current, started and kept in motion by the force of such air-current, to throw off the particles impacted against the inner walls of an inclosing chamber; also, that guns or destructive machines have been (No model.)

made in which centrifugal motion was applied to throw balls or bullets with great force and to great distances for war purposes.

This centrifugal pulverizer of my construction, is portable, inexpensive, and well adapted to accomplish its work, also insures durability, large capacity, extreme fineness of product, and minimum expenditure of power.

I provide the arms, which may be either straight or curved, with air-inlets near their outer ends, into which a rapid current of air will-be drawn as the arms revolve, which, rushing out of the arms with the material, Willimpel it with augmented force against the metal concussion-ring. These air-inlets may he in the form of a cup and placed near the ends of the arms, or in that of a hood surrounding the ends of the arms. The air rushing through the tubes or arms surrounding and carrying forward the hard substances to be reduced cushions the inner surfaces of the tubes and prevents wear, so that nearly all the wear in this pulverizer is upon the encircling metal anvil,

very hard substances to the desired fineness,

the coarser particles or tailings of the impact being returned to the same machine or to an-,

other similar machine, and so on until the end is attained.

In the drawings, A is the frame of the machine, supporting shaft B, on which is drivingpulley O. D is the spherical hollow hub; E E, the radial hollow tubes; G, the concussionring; H, thejaeketor support thereof; J, a covering or casing for these parts; I, the deliverin g-chute; K, the hopper, and T the hooded airinlet.

The action of the apparatus is as follows: Hopper K beingcharged with material, motion is given to shaft 13, which rotates hub D, into which the material is fed. The rapid rotation of the hub, assisted by action of centrifugal force, carries the material through radial tubes 5 E E and impels it against the hard metal surface of concussion-ring G. The ejection of the chine, of spherical receiving-hub D, radial tubes E E, provided with air-inlets T at or near the ends thereof, and concussion-ring G, constructed and operating together substantially as described.

2. In a pulverizing-machine, the hollow spherical hub provided with hollow radiating arms having hooded air-receiving openings or slots at or near the outer ends, as and for the purpose described.

LEWIS S. GHIOHESTER.

Witnesses:

S. J. GORDON, J. W. RIPLEY. 

